Notebook TERRA MOBILE 1541H

[antppe]

Hi all members, I'm Antonio and I write my first post from Italy. I will explain my problem: I have a notebbok TERRA MOBILE 1541H with cpu i7 4712mq with motherboard Clevo 6-71-W2W50-D02 which, when switched on,black screen. has start LED on, working CD-DVD, hard disk that can be heard spinning, fan stopped and CPU which naturally heats up. So what's the problem? Corrupted bios or burnt motherboard?

[Sephir0th]

Open the Laptop, visual inspection, Voltage at all coils present? If yes, I'd indeed start with BIOS Firmware.

[antppe]

Ok. Thanks for the reply. As soon as I have free time check.

[speggio91]

I don't know if it may be useful, but i attach the service manual of a similar models.

[antppe]

This is photo motherboard . On the two chips near the PCH there are just a few numbers and that's it.

[speggio91]

Originally Posted by antppe

This is photo motherboard . On the two chips near the PCH there are just a few numbers and that's it.

check these two chips, there should be the name of them on the pcb.
If they correspond to U15 and U16 then they are Main bios and EC.
Even if the name doesn't mach the schematics, try to check with a microscope or a magnifier the code over the top so you can identify what is it.

[antppe]

The abbreviation on the one highlighted is 2940S - A
423QB
the other has the initials 20N03
3M01

[antppe]

https://www.alldatasheet.com/datashe.../EN25QH64.html

https://www.alldatasheet.com/datashe.../EN25QH32.html

[SMDFlea]

Originally Posted by antppe

The abbreviation on the one highlighted is 2940S - A
423QB
the other has the initials 20N03
3M01

Those aren`t U15 and U16 ,the 20N03 is a mosfet.Look for U15 and U16 in white silkscreen

[antppe]

I found these on the EN25QH32 manual
EN25QH64

[antppe]

only these two are 8-pin

[antppe]

only these two are 8 pin

[SMDFlea]

Originally Posted by antppe

The abbreviation on the one highlighted is 2940S - A
423QB
the other has the initials 20N03
3M01

Post good clear readable pictures of both chips ,and the silkscrren around them

[antppe]

Here are the pictures you asked for

[SMDFlea]

Originally Posted by antppe

Here are the pictures you asked for

pictures of the chips on the motherboard

[antppe]

This is pictures of the chips on the motherboard

[antppe]

With the phone they do not come well, this is the same as the card that is in my possession

[antppe]

I think these are better

[antppe]

These in the photo are the only 8-pin chips that could contain the bios

[SMDFlea]

Originally Posted by antppe

I think these are better

The third picture,those are the bios chips.Gigadevice 25B32 and 25B64